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Cooper 12-Minute Run Test — VO2 Max Calculator

Enter distance covered in 12 minutes (miles, km, or meters) to instantly estimate your VO2 max in ml/kg/min and see your fitness category (Very Poor to Superior) against Cooper Institute norms for your age and sex.

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The Cooper 12-minute run test estimates aerobic fitness (VO2 max) by measuring how far you can run in exactly 12 minutes. Developed by Dr. Kenneth Cooper in 1968 and published in JAMA, it remains one of the most validated and widely used field tests for cardiorespiratory endurance. Enter your distance, sex, and age to get your estimated VO2 max in ml/kg/min and see how you rank against Cooper Institute fitness norms for your age group.

When to use this calculator

  • Tracking aerobic fitness improvements over a training cycle
  • Pre-season fitness screening for team sports
  • Setting training zones based on estimated VO2 max
  • Comparing your cardio level to age- and sex-matched norms
  • Evaluating readiness for endurance events like 5Ks or half-marathons
  • Monitoring cardiovascular health trends year over year

Cooper Institute VO2 Max Fitness Norms by Age & Sex (ml/kg/min)

SexAgeVery PoorPoorFairGoodExcellentSuperior
Male20–29<33.033.0–36.436.5–42.442.5–46.446.5–52.4≥52.5
Male30–39<31.531.5–35.435.5–40.941.0–44.945.0–49.4≥49.5
Male40–49<30.230.2–33.533.6–38.939.0–43.743.8–48.0≥48.1
Male50–59<26.126.1–30.931.0–35.735.8–40.941.0–45.3≥45.4
Male60+<20.520.5–26.026.1–32.232.3–36.436.5–44.2≥44.3
Female20–29<28.028.0–31.431.5–35.635.7–38.939.0–43.9≥44.0
Female30–39<27.027.0–30.430.5–33.733.8–36.937.0–41.0≥41.1
Female40–49<25.025.0–28.929.0–31.932.0–35.135.2–38.9≥39.0
Female50–59<21.021.0–23.924.0–27.928.0–31.431.5–35.7≥35.8
Female60+<20.020.0–22.923.0–25.926.0–29.429.5–32.4≥32.5

Fuente: The Cooper Institute — Physical Fitness Assessments and Norms for Adults and Law Enforcement (2013). Formula: VO2max = (distance_m − 504.9) / 44.73 (Cooper, JAMA 1968).

How it works

What is VO2 Max?

VO2 max is the maximum volume of oxygen your body can consume during intense exercise, measured in milliliters of oxygen per kilogram of body weight per minute (ml/kg/min). It is the single best indicator of cardiorespiratory endurance. The Cooper 12-minute run test estimates VO2 max from the distance covered in exactly 12 minutes — no lab equipment needed.

The Cooper Formula

VO2max (ml/kg/min) = (distance_meters − 504.9) / 44.73

Dr. Kenneth Cooper derived these regression coefficients (published in JAMA, 1968) by correlating 12-minute run distances against direct laboratory VO2 max measurements in 115 Air Force men. Correlation with lab values: r ≈ 0.90.

Distance → VO2 Max Quick Reference Table

Distance (miles)Distance (m)VO2 Max (ml/kg/min)
0.90 mi1,450 m21.3
1.00 mi1,609 m24.8
1.10 mi1,770 m28.4
1.25 mi2,012 m33.8
1.40 mi2,253 m39.2
1.49 mi2,400 m42.6
1.55 mi2,495 m44.7
1.65 mi2,655 m48.1
1.80 mi2,897 m53.5
2.00 mi3,219 m60.8
2.20 mi3,541 m68.0

(Use this table to quickly look up your result before calculating)

Unit Conversion

If you enter distance in miles, it is converted first: 1 mile = 1,609.344 m. If you enter kilometers: 1 km = 1,000 m.

Worked Example

A 28-year-old male runs 1.65 miles in 12 minutes.

1. Convert: 1.65 × 1,609.344 = 2,655.4 m
2. Formula: (2,655.4 − 504.9) / 44.73 = 48.1 ml/kg/min
3. Cooper norms for Males 20–29: 48.1 → Good range (42.5–46.4 is Good; he actually lands in Excellent at 46.5–52.4).

Fitness Categories (Cooper Institute Norms)

Males


AgeVery PoorPoorFairGoodExcellentSuperior
20–29<33.033.0–36.436.5–42.442.5–46.446.5–52.4≥52.5
30–39<31.531.5–35.435.5–40.941.0–44.945.0–49.4≥49.5
40–49<30.230.2–33.533.6–38.939.0–43.743.8–48.0≥48.1
50–59<26.126.1–30.931.0–35.735.8–40.941.0–45.3≥45.4
60+<20.520.5–26.026.1–32.232.3–36.436.5–44.2≥44.3

Females


AgeVery PoorPoorFairGoodExcellentSuperior
20–29<28.028.0–31.431.5–35.635.7–38.939.0–43.9≥44.0
30–39<27.027.0–30.430.5–33.733.8–36.937.0–41.0≥41.1
40–49<25.025.0–28.929.0–31.932.0–35.135.2–38.9≥39.0
50–59<21.021.0–23.924.0–27.928.0–31.431.5–35.7≥35.8
60+<20.020.0–22.923.0–25.926.0–29.429.5–32.4≥32.5

(Source: The Cooper Institute Physical Fitness Norms, 2013 edition)

Limitations

  • Field test accuracy: Correlation with lab VO2 max is ~r = 0.90 in trained populations but lower in untrained individuals.

  • Pacing errors: Uneven pacing (sprint-then-walk) underestimates fitness versus steady-state running.

  • Not suitable for: Clinical populations, individuals with cardiovascular disease, or those unaccustomed to running. Consult a physician before maximal-effort exercise testing.

  • Age extremes: Norms shown cover ages 20–69. Below 20 or above 69, use results directionally only.

  • This is an estimate, not a laboratory measurement. Direct VO2 max testing (metabolic cart) is the gold standard.
    • Disclaimer: Los resultados son orientativos y no reemplazan la consulta médica profesional. Antes de tomar decisiones con impacto, consultá con un médico, nutricionista o profesional de la salud matriculado.

    Frequently asked questions

    What is a good VO2 max score?
    It depends on age and sex. For men aged 30–39, 'Good' is 41.0–44.9 ml/kg/min and 'Excellent' is 45.0–49.4. For women aged 30–39, 'Good' is 33.8–36.9 and 'Excellent' is 37.0–41.0. Elite male endurance athletes often exceed 70 ml/kg/min.
    How accurate is the Cooper test compared to a lab test?
    Research shows correlations of r = 0.85–0.90 with direct VO2 max in reasonably fit adults. Accuracy drops for untrained individuals or those who pace poorly. Expect ±3–5 ml/kg/min error compared to a metabolic cart measurement.
    Can I walk instead of run?
    The formula was validated for running. Walking produces significantly shorter distances, causing the formula to underestimate your true VO2 max. If you must walk, consider the Rockport Walking Test formula instead, which was specifically designed for walkers.
    How often should I retest?
    Most coaches recommend retesting every 6–12 weeks after a structured training block. Testing more frequently than every 4 weeks rarely shows meaningful aerobic adaptation in healthy adults.
    Does altitude affect the result?
    Yes. Running at elevation (above ~5,000 ft / 1,500 m) reduces performance due to lower oxygen partial pressure, so distance covered will be shorter. The estimated VO2 max will understate your sea-level aerobic capacity at altitude.
    What is VO2 max exactly?
    VO2 max is the maximum volume of oxygen your body can consume per minute per kilogram of body weight (ml/kg/min). It is the gold-standard measure of aerobic capacity and a strong predictor of cardiovascular health and endurance performance.
    Why does the formula use 504.9 and 44.73?
    These are regression coefficients derived by Cooper (1968) from correlating 12-minute run distances against direct laboratory VO2 max measurements in military personnel. They convert distance in meters to an oxygen consumption estimate.
    Is this test safe for everyone?
    No. The Cooper test is a maximal-effort test. People with known heart disease, hypertension, diabetes, or who are sedentary and over 40 should get medical clearance before attempting it. The American College of Sports Medicine (ACSM) guidelines recommend pre-exercise screening.
    How does temperature affect performance?
    Heat and humidity significantly impair running performance and will lower your distance—and therefore your estimated VO2 max. Testing in temperatures above 75°F (24°C) or high humidity can underestimate fitness. Ideal conditions are 50–65°F (10–18°C) with low humidity.
    How do I prepare for the Cooper test?
    Rest 24–48 hours beforehand, avoid heavy meals 2–3 hours prior, warm up for 5–10 minutes, and run on a flat, measured track (standard 400 m track is ideal). Use a GPS watch or marked laps for accurate distance.

    Methodology & trust

    Editorial

    Calculadora de salud revisada por el equipo editorial de Hacé Cuentas, contrastada con Cooper KH (1968). A means of assessing maximal oxygen intake. JAMA, 203(3), 201–204., según nuestra política editorial y metodología.

    Updates

    Última revisión: June 20, 2026. Los parámetros se verifican periódicamente con las fuentes citadas.

    Privacy

    Calculations run 100% in your browser. We do not store or transmit your data.

    Limitations

    Indicative results. For critical decisions, consult a professional.

    📌 How to cite this calculator

    Rodríguez, M. (2026). Cooper 12-Minute Run Test — VO2 Max Calculator. Hacé Cuentas. https://hacecuentas.com/vo2-max-cooper-12min-calculator

    Contenido bajo licencia CC-BY 4.0 — reutilizable citando la fuente con enlace a Hacé Cuentas.

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